nVent Schroff, REAR ANGLE R 3U CPCI (2PC), EuropacPRO CPCI Rugged Rear Angle for Textil EMC Gasket for Side Panel, 3 U, Corner profile covers the slot between the side panel and the rear panel of a subrack., Required for shielding of rear, Can also be used as front closure when using a depth-adjustable 19" support bracket